Improvement in mainspring attachments for watch-barrels



E. H. FLINT, MAINSPRING ATTACHMENTS FOR WATCH-BARRELS.

No. 195,258. Patented Sept.18,1877.

WITNESSES: A INVENTOB W W ATTORNEYS.

PETERS. PHQTO-UYHQGHAPHER, VIAsHANGYGN, c C.

UNITED STATES EDWIN H. FLINT, OF CINCINNATI, OHIO. Y

PATENT OFFICE.

IMPROVEMENT IN MAINSPRING ATTACHMEN S FOR WATCH-BARREL S.

Specification forming part of Letters Patent No. 195,268, datedSeptember 18, 1877 application filed; June 11, 1877.

To all whom it may concern:

Be it known that I, EDWIN H. FLINT, of Cincinnati, in' the county ofHamilton and State of Ohio, have invented a new and Improved Watch, ofwhich the following is a specification Figure 1 represents the back ofthe movement. Fig. 2 represents the face side of the movement.

Similar letters of reference indicate corre sponding parts.

Referring to the drawing, A is the back plate of the watch, upon whichis formed the dustring a, which serves as a support for the faceplate B.The back plate A is chambered out to receive the mainspring b, and c isthe winding-arbor that passes centrally through the spring-chamber, andis provided with an arm, d, having a concave edge, e, which is beveledto receive a hook formed on the outer end of the mainspring b. The innerend of the mainspring is engaged by a hook that projectsfrom the boss ofthe barrel-wheel f.

The winding of the watch is effected by turning the arbor c, whichcarries the outer end of the spring around, and coils the inner end ofthe spring around the boss of the barrel-wheelf.

The advantages claimed for my improvtd Watch are that it is perfectlydust-proof, t does away with the usual retaining mechanism, and obviatesinjury to the watch in case the spring breaks.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1 An arbor-arm, (1, having the concave edge e, and amainspring having an outer book an d an inner end engagingwith hook onboss of barrel-wheel f, all arranged in mainspring-barrel, as shown anddescribed. 3

EDWIN HENRY FLINTQ Witnesses:

E. F. DBUGKEB, G. M. ToTToN.

